public class SynchronizedTest {
    public static int count = 0;
    public static Object locker = new Object();
    public static void main(String[] args) throws InterruptedException {
        Thread t1 = new Thread(()->{
            for (int i = 0; i < 50000; i++) {
                synchronized(locker) {
                    count++;
                }
            };
        });
        Thread t2 = new Thread(()->{
            for (int i = 0; i < 50000; i++) {
                synchronized (locker) {
                    count++;
                }
            };
        });
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println(count);
    }
}
